Here is how I do mine and it seems to go loads faster and be far easier to make sure you have a good connection
First I make up a buch of "pig tails" maybe 4-5" long install them in the heat tape as directed. PS I've tried using something other than the crimpers RBI sells for them and don't bother buy the crimpers and live long and prosper.
Then simply cut the female end off of a 10' two strand indoor/outdoor extention cord and seperate the two wires (leaving the plastic casing entact.
No go to your local electrical supply warehouse and get these. Make sure they are for the same gauge wire that your extension cord is.
then starting at the bottom install the tap connectors and pig tails as thus
When you're done you should have a fully wired rack with no risk of poor connections or solder failures.
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